Container forming machine



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C A A B United States Patent 3,416,412 CONTAINER FORMING MACHINE Isaac L. Wilcox, Fulton, N.Y., assignor to Phillips Petroleum Company, a corporation of Delaware Filed June 7, 1967, Ser. No. 644,293 11 Claims. (Cl. 93-391) ABSTRACT OF THE DISCLOSURE A container forming apparatus wherein a side wall blank is partially wrapped about a mandrel, with an end portion of the blank extending beyond the end of the mandrel. A bottom closure disk i-s positioned in the extending end portion of the partially wrapped blank and the latter is then completely wrapped about the mandrel and closure. Mechanism is provided to fold the extending end portion of the side wall blank inwardly in sealing engagement with the bottom disk. The overlapping portions of the side wall blanks and bottom closure disks are joined by heated thermoplastic coat- 1ngs.

Background of the invention This invention has to do with a compact machine for forming cylindrical containers from sheet material, such as paperboard. The containers are formed from flat side wall blanks and flat bottom closure disks. At the present time, cylindrical paper containers are formed by inserting a flanged bottom closure into a spirally wound tube, the end of which, together with the flange of the closure, is curled inwardly. Generally, such containers are not liquid tight.

Tapered containers, including paper cups, are formed by completely wrapping a blank about a mandrel, inserting a flanged closure into the end of the wrapped blank and curling, or spinning, the end of the wrapped blank and the flange of the closure, and the end closure is fixed to the wrapped blank by adhesive. In both instances, such methods require bulky machines which operate at relatively low speeds.

Brief summary of the invention In the machine of this invention, the flat side wall blanks are partially wrapped about a mandrel with one end portion of the blank extending beyond one end of the mandrel. A bottom closure disk, not provided with any flange, is moved radially of the mandrel and positioned in the extending end portion of the partially wrapped blank. The blank is then completely wrapped about the mandrel and about the closure disk. Thereafter, the extended end portion of the completely wrapped blank is folded inwardly and sealed to the bottom closure disk. This seal is effected by a coating of thermoplastic material on the contacting surfaces of the blanks, which material is heated prior to the sealing operation.

Brief description of drawings FIGURE 1 is a side elevational view of a container forming machine embodying my invention, the bottom blank magazine and feeding mechanism being omitted in the view.

FIGURE 2 is an end elevational view looking to the right, FIGURE 1.

FIGURE 3 is a top plan view of the structure shown in FIGURE 1.

FIGURE 4 is an enlarged view of the center portion of the structure shown in FIGURE 2.

FIGURE 5 is a View taken on line 55, FIGURE 4.

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FIGURE 6 is a view in top plan of the cam and linkage actuating mechanism of the side wall blank advancing structure.

FIGURE 7 is a view taken on line 77, FIGURE 6.

FIGURE 8 is a perspective view of the structure for intermittently advancing the side wall blanks.

FIGURE 9 is a view taken on line 9-9, FIGURE 5.

FIGURE 10 is a view taken on line 10-10, FIGURE 5.

FIGURE 11 is a view taken on a line corresponding to line 1111, FIGURE 1, showing the body blank wrapping jaw mechanism in elevation.

FIGURE 12 is a view taken on line 12-12, FIGURE 11.

FIGURE 13 is a view taken on line 13-13, FIGURE 11.

FIGURE 14 is a side elevational view of the bottom blank magazine and feeding mechanism, with parts omitted.

FIGURE 15 is a view looking to the right, FIGURE 14.

FIGURE 16 is a vertical sectional view of the structure shown in FIGURE 15, looking to the left.

FIGURE 17 is a View taken on line 17-17, FIGURE 14.

FIGURE 18 is a view taken on line 18-18, FIGURE 17.

FIGURE 19 is a top plan view of the bottom closure sealing mechanism and mandrel.

FIGURE 20 is a view taken on a line corresponding to line 20-20, FIGURE 19.

FIGURE 21 is a view taken on line 21-21, FIGURE 20.

FIGURE 22 is a view taken on line 22-22, FIG- URE 19.

FIGURE 23 is a view taken on line 23-23, FIGURE 22.

FIGURE 24 is an enlarged sectional view taken on line 24-24, FIGURE 22.

FIGURE 25 is a fragmentary sectional view showing the bottom closure sealing head moved into engagement with the wrapped side wall, with the end portion thereof folded over the disk.

FIGURE 26 is a view, similar to FIGURE 25, showing the bottom disk sealing head moved to sealing position.

FIGURE 27 is a side elevational view of the arrange ment for discharging the completed containers stripped from the mandrel. J

FIGURE 28 is a view corresponding to line 28-28, FIGURE 27.

FIGURE 29 is a top plan view of the cam arrangement and linkage for operating the various components in the area of the mandrel.

FIGURE 30 is a view taken on line 30-30, FIGURE 29.

FIGURE 31 is an enlarged sectional view through the bottom corner of the container and contiguous portions of the mandrel and forming tools.

FIGURE 32 is a side elevational view of the formed container, the left portion being in cross section.

FIGURE 33 is a view illustrating the successive steps in the formation of the container.

Detailed Description The flow sheet, FIGURE 33, illustrates schematically the formation of the container. Flat side wall blanks are successively withdrawn from a stack 41 and advanced in flat form underneath a heater. The heater functions to heat the upper marginal surface 42 extending along the leading edge of the blank, and the upper marginal surface 43 at one end of the blank. At the opposite end of the blank, the under side of the marginal surface 44 thereat is heated. The heated blanks are advanced to the position shown at underneath a fixed mandrel 47. With the blank in this U formation, a bottom are folded upwardly. The leading heated edge 42 of the blank extends forwardly of the downstream end of the mandrel 47. With the blank in this U formation, a bottom closure disk 49 having a heated edge portion is moved downwardly at the end of the mandrel. The partially wrapped blank 48 is then completely wrapped about the mandrel, as shown at 50, the ends of the blank overlapping to form the side wall seam 51. The extended heated end portion of the wrapped blank is then folded inwardly against the heated disk 49, as indicated at 53. The side wall blanks and bottom disk closures 49 are coated with a thermoplastic material at least in the areas 42, 43, 44, and accordingly, the infolded end portion 53 is sealed to the boto'm disk.

The container is moved forwardly off from the mandrel by a vacuum cup 54. Thereupon, the container is moved laterally from the machine, as by a paddle 55.

Referring now to the machine proper, it is mounted upon a rectangular base 60. Columns 61 extend upwardly from the left end portion of the base and support a table 62, FIGURES 1, 2 and 3. A pair of side plates 63 extend upwardly from the table 62 and support a top plate 64, see also FIGURES 4, 5, 6 and 7.

A bracket 67 is fixed at each side edge of the plate 64 at the forward end thereof. The brackets 67 incline upwardly and rearwardly and support a pair of bars 69. The bars 69 are spaced apart and connected by end pieces 70. The bars 69 are apertured to receive vertically disposed rods 72, and the end pieces 70 are apertured to receive similar rods 73. The rods 72, 73, provide a rectangular configuration for receiving the stack 41 of blanks 40. Retaining pieces 75, see FIGURE 3, are mounted in the bars 69 and have their inner ends extending inwardly a slight distance under the side edges of the blanks 40 to support the stack.

A pair of advancing rails 77 extend fore and aft under the stack of blanks, the rails being spaced apart laterally and provided at their rear end potions with fixed blank pushers 78. Each rail 77 is also provided with a pivotally mounted pusher 79 located forwardly of the pushers 78 and yieldingly maintained in upward position against stop pins 80. The rails 77 are also provided with a third set of pushers 81, like the pushers 79, and spaced forwardly thereof. The pushers 78, 79, 81, are spaced along the rails to provide proper advancement of the blanks 40 from one position to the next, the last being as indicated at 45 underneath the mandrel 47. The rear ends of the rails 77 are connected by straps 83 to the ends of rods 85. The rods 85 are slidably mounted in the hub portions 86 of a casting 87. The hub portions are formed with depending legs 88 positioned upon and secured to the top plate 64.

The inner ends of the rods 85 are connected together by a transversely extending shaft 90 to which is pivotally connected an arm 91, the opposite end of which is connected to a link 93, the lower end of which is fixed to a shaft journalled in the side plates 63, see FIGURES 6, 7 and 8. Also fixed to the shaft 95 is an arm 97, the free end of which is connected by adjustable linkage 98 to arm 99. The arm 99 is pivotally mounted, intermediate its ends, on a shaft 100 extending transversely between the plates 63. The opposite end of the arm 99 is provided with a roller 101 operating in a groove 102 formed in a cam 103 mounted on and rotatable with a shaft 104 also journalled in the side plate 63. The shaft 104 is rotated in timed relation with other mechanisms of the machine by a chain 105, trained over a sprocket 106- fixed to the shaft 104 and over a sprocket 107 fixed to a main drive shaft 200, FIGURE 29.

A plunger 108 is arranged at each side of the rail structure 77, the plungers 108 being movable vertically in blocks 109 fixed to the forward edge of the top plate 64, see FIGURES l, 2 and 7. The lower ends of plungers 108 are adjustably secured to a cross member 110 having a central depending lug 111 pivotally connected to an adjustable linkage 112, the lower end of which is pivotally connected to an arm 113, the inner end of which is journalled on the shaft 95, see FIGURES 6 and 7. A tension spring 114 serves to urge the arm upwardly to maintain a roller 115 thereon in engagement with the periphery of cam 116 fixed to the shaft 104, see FIGURES 1, 6 and 7. Bars 117 are fixed to the bearing blocks 109 and depend downwardly therefrom. Blocks 118 are adjusta-bly fixed to the lower ends of the bars 117, and are provided with rubber bumpers 120 against which the lower ends of the plungers 108 strike when the plungers are moved to their down position by cam 116.

Alfixed to the upper end of plunger 108 is a rubber vacuum cup 123, and each plunger is provided with a vacuum connection 124, see FIGURES 4 and 7. When the vacuum cups 123 are moved upwardly against the lowermost blank 40, see FIGURES 4 and 5, in stack 41 by the action of cam 116, permitting such movement by spring 114, vacuum is applied to the port 124. Upon downward movement of the vacuum cups 123, the lowermost blank 40 is pulled from the stack and deposited onto the rails 77. Thereupon, the rails 77 are moved forwardly by the cam 103, at which time the end portions of the blank are moved onto stationary rails 127 mounted on brackets 128 extending upwardly from the top plate 64. The blank is advanced by pushers 78 to the dotted position shown at 130, FIGURE 8, just forwardly of retaining members 131 fixedly mounted on the outer ones of the pairs of fixed rails 127. In this position, the blank is under heater 133, see FIG- URES l, 3 and 5. The heater is supported by brackets 134 depending from a cross member 135 carried by columns 136 extending upwardly from the top plate 64.

The heater 133 is L-shaped having an end portion 140. The arrangement is such that the heater heats the upper surface along the leading edge of the blank, as indicated at 42, FIGURE 33, and the end portion 140 heats the upper surface of the end portion at 43, FIGURES l0 4 and 33. There is a lower heater 143, see FIGURES 1, 5 and 10. This heater functions to heat the under marginal surface of the blank at the opposite end, The heater 143 is supported by columns 144 mounted on the plate 64.

During the heating of the blank, the rails 77 are returned to their starting position. The blank is retained under the heaters by the retaining members 131 on the fixed rails 127. The pushers 81 move under the blank due to the fact that the pushers are spring pressed upwardly and accordingly, can descend under the blank during the return movement of the rails 77. The blanks are held against the rails 127 beneath the heater 133 and in the next position by leaf spring members 146, FIGURE 5, one of which is fixed to one of the cross bars 69 of the side wall magazine, and the other is fixed to the heater 133. The vacuum cups 123 withdraw another blank from the stack and deposit it on rails 77 Upon the next actuation of the arm 91, the blank engaging members 79 on rails 77 move the heated blank forwardly along the rails 127 and forwardly of the retaining members on those rails, and the next succeeding blank is positioned under the heater by the pushers 78. The rails 77 are again returned to their starting position and upon the next operation of the blank advancing mechanism, pushers 81 on rails 77 move the first heated blank underneath the mandrel 47. The table 64 is formed with an elongated opening 147 to permit movement of the link 93.

A plate is mounted on a table structure 161 supported by columns 162 extending upwardly from the base 60. Angle brackets 163 are fixed to the sides of the plate 160 adjacent the rearward end thereof. These brackets 163 carry a cross member 164 to which the mandrel 47 is fixed, the mandrel extending downstream from the cross member, see FIGURES 1 and 3. The blank is positioned tangential to the underside of the mandrel, as indicated at 45 in FIGURES 11, 12 and 13, the blank being positioned between the underside of the mandrel 47 and a lower clamp member 167. The clamp member 167 has a depending stem portion 169 slidably mounted in a bracket 170 fixed to uprights 171 extending from the base 60 to the table top 160. The stem 169 is formed with a vertically extending slot 173 to receive a pin 174, FIGURE 13, on which wrapping jaws 175, 176, are pivotally mounted. The confronting surface of these jaws are of arcuate form and dimensioned comparable to the diameter of the mandrel 47. In their initial open position, as shown in FIG- URE 11, the jaws are adjusted so that the free end of the jaw 176 is positioned above the plane of the free end of the jaw 175. Each of the jaws is pivotally connected intermediate its ends to a push rod 180. The lower ends of these rods are freely slidable in bearings 181 mounted on a casting 182 which is slidable vertically on rods 183 fixed at their ends in mounting blocks 184 which, in turn, are fixedly secured to the columns 171, A compression spring 187 encircles each of the rods 180 and is interposed between an adjusting nut 188 at the upper ends of the rods and the bearing blocks 181. The lower ends or" the rods are provided with adjusting nuts 190, FIGURE 30, to limit upward movement of the rods and jaws by action of the springs 187. An adjustable linkage 191 connects the carriage 182 to an arm 193 which is pivotally mounted on a pin 194, see FIGURE 29. The pin is supported in a bracket 195 mounted on the base 60.

The arm 193 is provided, intermediate its ends, with a roller 197 positioned in a cam track in cam 198. The cam 198 is fixed to a shaft 200 journalled in bearings 201 mounted on the base 60. Rotation is imparted to the shaft 200 by a chain drive 203 operated by the output of a reduction gearing 204 driven by the main motor 205, see FIGURES l, 3 and 29. This arrangement imparts vertical reciprocation to the carriage 182 and swinging movement of the jaws 175, 176, about the pivot pin 174 initially to the position shown in FIGURE 17. As the outer free ends of the jaws are swung upwardly against the blank 45, the laterally extending portions of the blank are moved upwardly to the position shown in FIGURE 17, at 48, and, in FIGURE 33. Due to the fact that the free end of the jaw 176 was initially located above the free end of the jaw 175, as explained in connection with FIGURE 11, the side of the blank contacted by the jaw 176 is moved to vertical position. However, the opposite side of the blank, contacted by the jaw 175, has not been moved to the full vertical position. At this time, the blank is clamped securely against the underside of the mandrel by the lower clamp 167. The clamp 167 is moved upwardly by a push rod 207, the upper end of which is connected to the stem 169 of the clamp, and the lower end is arranged for free sliding movement in a cross member 208 fixedly mounted on spacers 209 fixed to the columns 171.

A collar 210, FIGURE 11, is fixed to the rod 207 and is maintained against the undersides of stop projections 211 fixed to the carriage 182. A compression spring 212 is interposed between the guiding cross member 208 and the collar. Accordingly, upon initial upward movement of the carriage 182, the collar and rod 207 are moved upwardly by the spring 212, moving the clamp 167 against the blank and clamping the blank against the underside of the mandrel 47. Upon further upward movement of the carriage 182, force is exerted through springs 187 against the nuts 188, moving rods 180 upwardly and swinging the wrapping jaws inwardly to the position shown in FIG- URE 17. It will be recalled that the heated leading edge portion of the blank is extending downstream beyond the mandrel 47.

There are a series of columns, as 213, extending upwardly from the top table plates 64 and 160. These columns support a superstructure including a magazine and feeder for the container bottom disks, and a heater for heating the bottom disks. The bottom disk magazine is shown at 214 in FIGURES l4 and 15. It is of tubular formation and arranged to support a supply of bottom disks 49 in stack formation. These disks are successively removed from the magazine by a suction cup 215 carried by an arm 216 fixed to a shaft 217 journalled in a bracket associated with the magazine 214. The shaft is oscillated by a link 219 which is actuated by a crank disk 220. When the suction cup 215 is swung upwardly into contact with the lowermost disk in the magazine, vacuum is supplied through a connection 223. When the arm is swung downwardly, the lowermost disk is withdrawn by the suction cup, and deposited into a vertical guideway 225.

The guideway is formed by vertically disposed members 226, 227, the confronting edges of which are formed with slots, see FIGURE 18, for guiding the disks downwardly to the end of the mandrel into the partially folded side wall blank shown in FIGURE 17. The crank disk 220 is rotated in timed relation to the side wall blank advancing mechanism whereby, when a side wall is removed from the stack 41 for deposit on the rails 77, a bottom disk is withdrawn from the magazine 214 and deposited in the guideway. It is, of course, necessary that the disk, withdrawn from the magazine 214, arrives in the partially folded blank. Accordingly, there are a number of disks descending in the guideway 225 and a plurality of side wall blanks advancing on the guide rails 127.

Stop members 230, of hell crank form, are pivotally mounted in the rail 227. The stop members 230 have end portions 231 that are yieldingly urged into the guide slot 228 of the guide rail 227 and serve to prevent the disks from dropping free in the guide. In FIGURES 15 and 17, there are two of the disks being retained by the members 230. A positive disk feed is provided. It consists of a pair of bars 233 fixed to a rod 234 journalled in bearings 235 attached to a bar 236, the end portions of which are slidably mounted in cross members 237 forming part of the disk guide structure. An arm 240 is attached to the bar 236 and extends laterally therefrom and is connected to a link 241.

A compresion spring 242 on rod 234 is interposed be tween the lower bar 233 and the upper bearing 235, the spring serving to prevent free rotatable movement of the shaft and bars 233. Each of the bars 233 is provided with pins 245 which extend inwardly between the vertical guides 226, 227, for engagement with the bottom disks 49. The upper arm 233 is fixed to the upper end of the shaft 234 and has a radially extending arm 248. There is an inclined cam arm 250 attached to the vertical member 251, and there is a similar inclined arm 252 attached at the lower end of the member 251, see FIGURE 15. Attached to the lower arm 233 is an arm 257, similar to the arm 248. When the assembly is moved to the upper position, as shown in FIGURE 17, by link 241, engagement of the cam arm 250 by the arm 248 will cause the bars 233 to swing inwardly to position the pins 245 for engagement with the bottom disks. Upon downward movement of the assembly, the pins 245 will move the disks downwardly in the guides 226, 227. At the bottom of the stroke of the assembly, the arm 257, engaging the cam arm 252, will cause the bars 233 to swing outwardly, in which position they are maintained until the arm 248 engages the cam member 250. Downward movement of the disks by the pins 245 will move the disks past the retaining members 230.

With this arrangement, it will be apparent that the disks are moved downwardly successively in the guide chute. During the dwell of a disk, indicated at 260, FIGURE 17, heat is applied to the disk by a heater 261, see FIGURES 3 and 14. During the dwell of the disk at this position, the heater 261 is moved into heat exchanging relation to the disk. The heater 261 is carried by a plunger 263 slidably mounted in a bracket 264. The plunger is provided with a gas connection 265 and is connected to the piston rod 266, FIGURE 3, of a cylinder 267. The cylinder is supplied with fluid pressure to move the heater 261 into juxtaposition with the bottom disk blank 49 at the position 260 for heating the blank during the dwell period thereof. As the bottom disk feed mechanism is reciprocated, the bottom disk blanks 49 are successively advanced to a position at the downstream end of the mandrel 47, the blanks being deposited into the extending portion of the partially wrapped blanks.

When the blank is partially wrapped about the mandrel, as shown in FIGURE 17, the bottom disk advancing assembly is moved downwardly by the link 241. The lower end of this link is pivotally connected to an arm 270, FIGURE 14, pivotally mounted in a bracket 271, and having a depending portion provided with a roller engaged by a lobe 273 on cam 272. The cam is mounted on shaft 274, as is also the crank disk 220 for operating the disk feeder vacuum cup 215. The shaft 274 is journalled in bearings 275, FIGURE 20, and is driven by a chain 276 trained over a sprocket on the shaft and a sprocket 277, FIGURE 29, the latter sprocket being affixed to the main cam shaft 200. During this operation, the upper clamp member 280, FIGURES 14, 16 and 19, is moved downwardly toward the mandrel. This upper clamp member is fixed to a shaft journalled in a bearing bracket 281 fixed to the cross member 164.

The clamp includes a finger 283 pivotally mounted at one end at 284 to the clamp. The finger piece 233 is yieldingly urged downwardly against the clamp by a leaf spring 285. Mounted on the side member 227 of the bottom disk vertical guide, there is a rod 287 having a portion extending transversely of the vertical disk guide, FIGURE 15. The rod 287 is carried by a block 288 pivotally mounted at 289 to the side member 227. Downward movement of the rod is restrained by a pin 290. However, the rod can swing upwardly.

The shaft 291, to which the clamp 280 is affixed, also carries an upwardly inclined arm 292, the upper end of which is connected to a link 293, the opposite end of which is connected to a vertically disposed link 294 through a yieldable coupling 295, FIGURES l4 and 19. The arm 294 is pivotally mounted at ite lower end and is provided with a roller 297 engaging cam lobes 299, 300, the cam being also fixed to the shaft 274, FIG- URES 20, 2 1.

As the clamp 280 is moved downwardly, the outer free end of the finger 283 engages the rod 287 and is moved upwardly away from the clamp about its pivot 284. However, as the clamp moves downwardly, the finger 283 snaps off from the rod 287, and moves into the disk guide engaging the bottom closure disk moved downwardly by the lower bar 233, and moving the disk positively into the extending end portion of the partially wrapped side wall blank. The clamp is thereupon moved upwardly to the positions shown in FIGURES l4 and 16. This motion is imparted to the clamp by the short cam lobe 299.

With the heated bottom disk mechanism positioned in the partially wrapped side wall blank, the cam 198 now effects further upward movement of the carriage 182, FIGURES 11 and 12, swinging the jaws 175, 176, about their pivotal mounting to fully wrapped position. During this movement, the side portion of the blank contacted by the jaw 176 is wrapped about the mandrel preceding the wrapping of the opposite side of the blank by the jaw 175. This results from the initial setting of the jaws, as previously pointed out. The free ends of the jaws 175, 176, do not meet, whereby the overlapping side edges of the blank are exposed for engagement by the clamp 280 which is again moved downwardly by cam lobe 300, engaging the side wall seam and clamping the side wall against the top of the mandrel.

It will be understood that all of these operations occur in a timed sequence. As soon as the upper clamp 280 has engaged the side wall seam of the wrapped side wall, a folding and sealing mechanism is moved toward the mandrel. This mechanism is best shown in FIGURES 19, 23-26. It consists of a carriage 303 having bosses 304 slidably mounted on rods 305 fixed at their ends to supporting blocks 307 mounted on the table top The carriage is movable toward and from the downstream end of the mandrel 47. The carriage is apertured to slidably receive a plunger 310 provided at one end with a cross head 311 to which, in FIGURES 24, 26, is affixed a ring member 312, as by screws, one of which is shown at 313. A pressure ring 314 is fixed to the ring 312 by screws, one shown at 315, FIGURE 24.

The end of the carriage, confronting the mandrel, is counterbored to receive the cross head 311 and the ring members 312, 314. The rear end of the carriage 30-3 is formed with a pair of circular recesses in which are mounted compression springs 317. A cross head 318, FIGURES 19, 23, is pinned to the rear extending end of the plunger 310. The cross head 318 is provided with threaded apertures to receive screws 320', the ends of which extend into the compression springs and carry collars 321.

With this arrangement, the plunger 310 is held in inner or rear position in the carriage, as shown in FIGURES 23 and 24. There is an annular folding member 325 fixed to the for-ward end of the carriage and it is arranged concentrically about the pressure ring 314.

The plunger 310 is apertured to slidably receive a stem 327, to the forward end of which is affixed a vacuum cup 54. The stem is formed with an axially extending passage 329 connecting with a transverse passage 330'. The stem 327 is urged forwardly by a spring 331, the limit of this movement being controlled by a set screw 333 threaded through the side wall of the plunger 310 and engaging an axially extending keyway in the stem, FIGURE 23.

A clevis member 335 is pivotally connected to the cross head 318. A push rod 337 is slidably mounted in the clevis 335 which is joined to a T head 338. The rod 337 is threaded to receive an adjusting nut 340. A compression spring 341 is interposed between the nut 340 and the clevis 335. The opposite end of the rod is pivotally joined to an arm 343 which, in turn, is pivotally mounted intermediate its ends on a bracket 195, FIGURE 30. The lower end of the arm is provided with a roller 346 engaging a cam 347 fixed on shaft 2200.

Upon forward movement of the carriage toward the mandrel, the suction cup 54 is moved into engagement with the bottom disk 49. As the carriage advances toward the mandrel, the folding ring 325 engages the extended end portion of the wrapped side wall, and by the configuration of the folding ring, the extended portion of the side wall is folded radially inwardly, as shown in FIGURE 25. This movement has been imparted to the carriage through the springs 317 which now compress upon further movement of the plunger 310'. Continued movement of the plunger 310' effects movement of the sealing ring 314 into engagement with the infolded portion 350 of the side wall, see FIGURE 25. The advance ment of the plunger and sealing ring 314 continues, compacting the infolded portion 350 of the side wall against the bottom disk 49 and pressing the latter against the end of the mandrel 47.

The rear or downstream end of the mandrel 47 is formed with a circular rib 360 adjacent the periphery of the mandrel. The folding ring 325 is formed with a cylindrical flange 361 confronting the mandrel and the inner surface is formed on a curvature 362 which, upon engagement with the extending end portion of the wrapped side wall, functions to serve to fold the same inwardly over the bottom disk 49. The pressure ring 314 is formed with concentric circular ribs 363, 364. These ribs engage the infolded portion 350 of the side wall and apply high pressure to the areas thereof indicated at 365, 366, FIG- URE 32, to effect a proper and permanent seal between the infolded portion 350 and the bottom disk 49.

When the plunger has been moved to effect the sealing of the bot-tom disk, the stern 327 is moved inwardly of the 

